i tried this already it still wont fire up

Reove gas cap and try it,the vent in cap may be stopped up.

hello zukifreak i am back again with another problem with my suzuki quadrunner 250 1999 .
the engine is swinging perfectly and fast enough but just wont fire up ..........i have a small feeling that its the spark but the quad was recently fail to start in morning or when it was cold and had more than quather tank of petrol i found this extremily weird but once petrol drop it started fine it done this for several weeks but i ignored im not sure if it has anything to do with wat is wrong now but you seem to know suzuki extremly well